Kaufman , Texas -LRB- CNN -RRB- -- A Texas community is on edge after a district attorney who said he would put away the `` scum '' who killed a colleague two months ago was shot to death alongside his wife in his home Saturday night .

Kaufman County Judge Bruce Wood said he thought there was a `` strong connection '' between the slayings of Mike and Cynthia McLelland and the shooting death of Kaufman County Assistant District Attorney Mark Hasse , who was killed on his way to work in January .

Hasse and McLelland `` worked on similar cases very closely , '' said Wood , the county 's top elected official .

And Kaufman Mayor William Fortner told CNN that he thought the men were targeted by people seeking revenge .

`` That 's the logical conclusion , and I do n't have any information that directs me to think that 's the case , but that 's what you would assume under the circumstances , since they targeted two people from our prosecutors . ''

The Kaufman County sheriff 's office , however , wo n't officially say the killings are connected .

`` I ca n't say that , '' Kaufman County Sheriff David Byrnes told reporters . `` No , we have nothing indicating that for sure . ''

Federal and state law enforcement descended rapidly on the crime scene to aid in the investigation .

Just two months ago , McLelland vowed to find the people who killed Hasse , one of his top deputies .

On Saturday , authorities found the McLellands ' bodies in their home in Kaufman County , east of Dallas .

`` I do n't know of anyone who would want to cause him harm , '' Fortner said . `` As far as I could tell , he was doing a really good job as a district attorney . ''

Fortner said he hoped the killer or killers were caught `` before any more people are lost . ''

Wood and McLelland last spoke last week .

`` He never stated to me that he was worried , '' Wood said . `` But everybody that works in the courthouse has been on edge , but he never indicated any fear to me . ''

Authorities are providing extra security for others , and the Kaufman County district attorney 's office will be closed on Monday .

`` We are taking precautions to protect other elected officials in the county , '' Byrnes told reporters Sunday . He declined to say what those measures were .

Byrnes offered no details as to how the McLellands were killed .

A law enforcement source told CNN that investigators at the McLellands ' home recovered several shell casings at the scene of the crime . The casings are from a .223 - caliber rifle , the source said .

Authorities have not identified a suspect .

McLelland was an Army veteran who later earned a master 's degree in psychology and became a psychologist for the Texas Department of Mental Health and Mental Retardation , the district attorney 's website said .

He was raised in the small town of Wortham , Texas , where his parents had a ranch . He joined the Army after attending the University of Texas and spent 23 years in the service .

He later earned his law degree and practiced as a defense attorney and mental health judge for 18 years before becoming the county 's district attorney in 2010 .

McLelland and his wife leave behind two daughters and three sons . One son is a Dallas police officer .

Another top prosecutor slain

The McLellands were killed almost exactly two months after Hasse was shot to death in broad daylight outside the county courthouse on January 31 .

Hasse had feared for his life and carried a gun to work , said a Dallas attorney who described herself as his longtime friend .

Colleen A. Dunbar said she spoke with Hasse on January 24 . She said the prosecutor told her he had begun carrying a gun in and out of the county courthouse daily .

`` He told me he would use a different exit every day because he was fearful for his life , '' Dunbar told CNN .

She said that Hasse gave no specifics on why he felt threatened -- only that he did .

McLelland called Hasse `` a stellar prosecutor '' who knew that threats were part of the job .

He vowed after Hasse 's slaying to put away the `` scum '' who killed his deputy .

`` I hope that the people that did this are watching , because we 're very confident that we 're going to find you , '' McLelland told reporters .

`` We 're going to pull you out of whatever hole you 're in , we 're going to bring you back and let the people of Kaufman County prosecute you to the fullest extent of the law . ''

Attorney Pete Schulte told CNN affiliate WFAA that public servants are facing a new quandary .

`` It 's going to have a chilling effect on people who do want to step into those roles and -LRB- have to think about whether to -RRB- start arming themselves , '' he said . `` I mean , that 's the risk that we 're going to face now because of this happening . ''

Schulte told the station that after someone shot through the windows of his Dallas offices in November , he began to carry a gun more often .

CNN 's Ed Lavendera reported from Kaufman , and AnneClaire Stapleton and Holly Yan from Atlanta .

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NEW : Investigators find various shell casings from a .223 - caliber rifle , a source says

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NEW : The Kaufman County district attorney 's office will be closed Monday

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Kaufman County DA Mike McLelland and his wife , Cynthia , are found dead in their home

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Two months ago , McLelland 's deputy was shot to death outside the county courthouse